HttpWebResponse发送post请求并接收

HttpWebResponse发送post请求并接收

1: HttpWebResponse 发送POST请求

        #region 发送请求
        /// <summary>
        /// 根据请求的xml，获取返回后的xml数据
        /// </summary>
        /// <param name="strRequestXml"></param>
        /// <param name="isB">是否调用B接口地址</param>
        /// <returns></returns>
        public static string GetResponseXml(string strRequestXml, bool isB = true)
        {
            HttpWebRequest httpWebRequest;
            string url = isB ? FreeConfig.TrafreeUrl_B : FreeConfig.TrafreeUrl_C;
            //如果是发送HTTPS请求  
            if (url.StartsWith("https", StringComparison.OrdinalIgnoreCase))
            {
                ServicePointManager.ServerCertificateValidationCallback = CheckValidationResult;
                httpWebRequest = WebRequest.Create(url) as HttpWebRequest;
                httpWebRequest.ProtocolVersion = HttpVersion.Version10;
                httpWebRequest.Headers.Add(HttpRequestHeader.AcceptEncoding, "gzip,deflate");
            }
            else
            {
                httpWebRequest = WebRequest.Create(url) as HttpWebRequest;
            }
            Encoding code = Encoding.GetEncoding(FreeConfig.InputCharset.Trim().ToLower());
            //request.Timeout = 20000;
            httpWebRequest.UserAgent =
                "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.97 Safari/537.11";
            httpWebRequest.ContentType = "text/html;charset=" + FreeConfig.InputCharset.Trim().ToLower();
            httpWebRequest.Method = "POST";
            httpWebRequest.MaximumResponseHeadersLength = 999999999;
            httpWebRequest.ReadWriteTimeout = 9999999;


            byte[] bs = code.GetBytes(strRequestXml.Trim());
            httpWebRequest.ContentLength = bs.Length;
            using (Stream requestStream = httpWebRequest.GetRequestStream())
            {
                requestStream.Write(bs, 0, bs.Length);
                requestStream.Close();
            }


            string strResponse = string.Empty;
            using (var response = (HttpWebResponse)httpWebRequest.GetResponse())
            {
                //strResponse = GetResponseStraem(response, code);
                strResponse = GetResponseStreamByBytes(response, code);
            }
            return strResponse;
        }


        private static string GetResponseStraem(HttpWebResponse response, Encoding code)
        {
            string strResponse = string.Empty;
            Stream stream = response.GetResponseStream();
            if (stream != null)
            {
                using (var read = new StreamReader(stream, code))
                {
                    strResponse = read.ReadToEnd();
                }
            }
            return strResponse;
        }


        private static string GetResponseStreamByBytes(HttpWebResponse response, Encoding code)
        {
            var bl = new List<byte>();
            var stream = response.GetResponseStream();
            int b;
            while ((b = stream.ReadByte()) != -1)
            {
                bl.Add((byte)b);
            }
            return code.GetString(bl.ToArray());
        }


        private static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
        {
            return true; //总是接受  
        }

1.  获取流

     HttpWebRequest request= (HttpWebRequest)WebRequest.Create(uri); //构建http request
     request.Method = "get";
     HttpWebResponse response = (HttpWebResponse)hwr.GetResponse();    //发出请求并获得Response
     resStream = response.GetResponseStream();          //获得Response的流

2. 读
1).  第一种方式:
      int count = (int)response.ContentLength;
                int offset = 0;
                buf = new byte[count];
                while (count > 0)
                {
                    int n = resStream.Read(buf,offset,count);
                    if (n == 0) break;
                    count -= n;
                    offset += n;
                    Console.WriteLine( "in loop " + getString(buf) ); //测试循环次数
                }
     string content = Encoding.Default.GetString(buf, 0, buf.Length);

     必须循环读流, 不能一次读(resStream.Read(buf,0,count); ), 否则读的流可能不完整

    还有一种方式:

    private static string GetResponseStreamByBytes(HttpWebResponse response, Encoding code)
        {
            var bl = new List<byte>();
            var stream = response.GetResponseStream();
            int b;
            while ((b = stream.ReadByte()) != -1)
            {
                bl.Add((byte)b);
            }
            return code.GetString(bl.ToArray());
        }

2) 第二种方式://用StreamReader读取流
     string content = "";
     using (StreamReader  sr = new StreamReader(resStream))     
     {
          content = sr.ReadToEnd();
     }